1. Fire hoses used in major structure fires have inside diameters of 6.4 cm. Suppose such a hose carries a flow of 40 L/s starting at a gauge pressure of 1.62 x 10°N/m². The hose goes 10 m up a ladder to a nozzle having an inside diameter of 3 cm. Assume negligible resistance, density of water is 1000 kg/m³, and atmospheric pressure = 1.013×105 Pa. Using the flow rate (a) Calculate the velocity at the start of the hose. ✔m/s V start (b) Calculate the velocity at the nozzle. m/s V nozzle = (c) Calculate the gauge pressure at the nozzle, Pnozzle If Pnozzle Pnozzle P. atm <3%, then enter P nozzle = 0, <3%, then we are going to assume that the atm else enter the calculated value. If absolute pressure at the nozzle is approximately equal to the atmospheric pressure, making the gauge pressure almost zero when compared to the atmospheric pressure. Pnozzle ✔Pa
1. Fire hoses used in major structure fires have inside diameters of 6.4 cm. Suppose such a hose carries a flow of 40 L/s starting at a gauge pressure of 1.62 x 10°N/m². The hose goes 10 m up a ladder to a nozzle having an inside diameter of 3 cm. Assume negligible resistance, density of water is 1000 kg/m³, and atmospheric pressure = 1.013×105 Pa. Using the flow rate (a) Calculate the velocity at the start of the hose. ✔m/s V start (b) Calculate the velocity at the nozzle. m/s V nozzle = (c) Calculate the gauge pressure at the nozzle, Pnozzle If Pnozzle Pnozzle P. atm <3%, then enter P nozzle = 0, <3%, then we are going to assume that the atm else enter the calculated value. If absolute pressure at the nozzle is approximately equal to the atmospheric pressure, making the gauge pressure almost zero when compared to the atmospheric pressure. Pnozzle ✔Pa
Physics for Scientists and Engineers
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Chapter18: Temperature
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Transcribed Image Text:1. Fire hoses used in major structure fires have inside diameters of 6.4 cm. Suppose such a hose
carries a flow of 40 L/s starting at a gauge pressure of 1.62 x 10°N/m². The hose goes 10 m
up a ladder to a nozzle having an inside diameter of 3 cm. Assume negligible resistance,
density of water is 1000 kg/m³, and atmospheric pressure = 1.013×105 Pa.
Using the flow rate
(a) Calculate the velocity at the start of the hose.
✔m/s
V start
(b) Calculate the velocity at the nozzle.
m/s
V nozzle
=
(c) Calculate the gauge pressure at the nozzle, Pnozzle If
Pnozzle
Pnozzle
P.
atm
<3%, then enter P
nozzle
= 0,
<3%, then we are going to assume that the
atm
else enter the calculated value. If
absolute pressure at the nozzle is approximately equal to the atmospheric pressure, making
the gauge pressure almost zero when compared to the atmospheric pressure.
Pnozzle
✔Pa
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